Publicação
Ajustamento da Rede Geodésica Nacional com observações GNSS
| dc.contributor.author | Brito, Carolina Domingos | |
| dc.contributor.institution | Faculty of Sciences | |
| dc.contributor.supervisor | Ferreira, Ana Cristina Navarro | |
| dc.contributor.supervisor | Fernandes, João Carlos da Costa Catalão | |
| dc.date.accessioned | 2026-02-19T17:00:01Z | |
| dc.date.available | 2026-02-19T17:00:01Z | |
| dc.date.issued | 2026 | |
| dc.description | Trabalho de projeto de mestrado, Engenharia Geoespacial, 2026, Universidade de Lisboa, Faculdade de Ciências | |
| dc.description.abstract | This dissertation aims to process and adjust historical and recent GPS/GNSS observations of the National Geodetic Network (RGN), estimating the coordinates of geodetic vertices (GVs) within the PT-TM06/ETRS89 reference system. Developed under Cooperation Agreement No. 5558 – CEXC/4623/2024 between the Directorate-General for Territory (DGT) and the Faculty of Sciences of the University of Lisbon (FCUL), this work focuses on consolidating and updating the RGN, ensuring compatibility with the ETRF2020 reference frame and reinforcing its importance as a fundamental infrastructure for high-precision geospatial applications. Historical RGN observations conducted between 1997 and 2005 present heterogeneity in equipment, observation duration and spatial coverage, requiring noise analysis and the definition of an appropriate stochastic model. In 2025, a new campaign was carried out covering 135 GVs, processed using Leica Infinity, enabling data integration, rigorous modelling and quality assessment. Initially, six sub-networks were adjusted using 1997–2005 GPS data, detecting inconsistencies and testing conditioning strategies. Mean differences were below 0.5 cm in planimetry and 10 cm in height relative to official coordinates. The global adjustment, involving 953 stations and 3 332 baselines, achieved the best results by fixing CABR, APED and SOBR and using ellipsoidal heights, yielding millimetric discrepancies in M and P. The inclusion of 2025 observations and ReNEP permanent stations increased stability and robustness. When historical data were also considered, the network comprised 1 029 vertices and 3 985 baselines, with mean differences of about 5 cm in M, 9 cm in P and 6 cm in height, values similar to those obtained using only the recent dataset. The results demonstrate consistency between campaigns and support the transition of the RGN to ETRF2020, ensuring temporal coherence and greater reliability for future GNSS applications and research developments. | en |
| dc.format | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/10400.5/117212 | |
| dc.language.iso | eng | |
| dc.subject | National geodetic network | |
| dc.subject | GNSS | |
| dc.subject | ReNEP | |
| dc.subject | adjustment | |
| dc.title | Ajustamento da Rede Geodésica Nacional com observações GNSS | en |
| dc.type | master thesis | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess |
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